I powered through my side-by-side comparison of all my tapered bore low D whistles this afternoon:
https://www.youtube.com/watch?v=Jn5NtmEASC8
I also posted the individual videos in an earlier thread, but here they are again for your convenience:
Onyx: https://www.youtube.com/watch?v=sSET5MQfenw
Shaw: https://www.youtube.com/watch?v=m8gyk5o7h3k&t=326s
Tony Dixon: https://www.youtube.com/watch?v=QiByycDeFwE